1 #include <u.h>
2 #include <libc.h>
3
4 void*
memmove(void * a1,void * a2,ulong n)5 memmove(void *a1, void *a2, ulong n)
6 {
7 char *s1, *s2;
8
9 if((long)n < 0)
10 abort();
11 s1 = a1;
12 s2 = a2;
13 if((s2 < s1) && (s2+n > s1))
14 goto back;
15 while(n > 0) {
16 *s1++ = *s2++;
17 n--;
18 }
19 return a1;
20
21 back:
22 s1 += n;
23 s2 += n;
24 while(n > 0) {
25 *--s1 = *--s2;
26 n--;
27 }
28 return a1;
29 }
30
31 void*
memcpy(void * a1,void * a2,ulong n)32 memcpy(void *a1, void *a2, ulong n)
33 {
34 return memmove(a1, a2, n);
35 }
36